Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-12-28
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
2 pages, 2 figures, Proceedings SF2A 2010
Scientific paper
According to the hierarchical model, small galaxies form first and merge together to form bigger objects. In parallel, galaxies assemble their mass through accretion from cosmic filaments. Recently, the increased spatial resolution of the cosmological simulations have emphasised that a large fraction of cold gas can be accreted by galaxies. In order to compare the role of both phenomena and the corresponding star formation history, one has to detect the structures in the numerical simulations and to follow them in time, by building a merger tree.
Combes Francoise
L'Huillier Benjamin
Semelin Benoit
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